Gaya APA
SJAH, D., ENONG, A.
(1983).
Practical guide to business correspondence / Djalinus Sjah
.
Jakarta:
Simplex.
Gaya MLA
SJAH, Djalinus., ENONG, Azimar.
"Practical guide to business correspondence / Djalinus Sjah".
Jakarta:
Simplex,
1983.
Text.